(4*h*sqrT(v/h)+v/h)`=
=4*h`*sqrt(v/h)+h*(sqrt(v/h))`+sqrt(v/h)`=
=4*sqrt(v/h)+h*1/2*((h-v)/h^2)^(-1/2)+(h-v)/h^2=
=4*sqrt(v/h)+h/2(h^2/(h-v)^1/2+(h-v)/h^2=....

и снова тупик...sad.gif